Skin gets thinner with age. The number of new cells you produce decreases slightly. Your body also makes less collagen (which keeps the skin firm) and elastin (which keeps the skin flexible). Also, you lose some of the fatty layer underneath your skin, making the skin seem even thinner. These processes accelerate with a lot of exposure to sunlight. In fact, the ultraviolet (UV) light from the sun destroys collagen and elastin.Use a sunscreen and wear protective clothing to safeguard your skin from the sun’s harmful rays.